The MF/HF receiver fails to suppress the AF...

Question 1 / 20ZaEJ75nL3px33cX7s3lS

Question 1 of 20ZaEJ75nL3px33cX7s3lS

The MF/HF receiver fails to suppress the AF output in the absence of a sufficiently strong input signal. What is the most likely cause?

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Question 1 of 20

ZaEJ75nL3px33cX7s3lS

The MF/HF receiver fails to suppress the AF output in the absence of a sufficiently strong input signal. What is the most likely cause?

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🔍 Key Concepts

• AGC (Automatic Gain Control) affects receiver sensitivity and volume based on signal strength • Squelch is used to mute audio when no usable signal is present • Difference between circuits that control audio output vs. those used for CW/SSB (like BFO)

💭 Think About

• Which circuit’s main job is to keep you from hearing noise or hiss when there is no strong signal present? • If the symptom is hearing unwanted background noise when no signal is present, which circuit, when failed, would no longer mute the audio path? • Which of the listed circuits is specifically designed to act based on the presence or absence of a signal, rather than shaping or amplifying it all the time?

✅ Before You Answer

• Identify which circuit is responsible for muting audio in the absence of a valid RF signal • Distinguish between circuits that control gain (AGC) and those that open/close the audio path based on signal level • Confirm which circuit is not primarily involved with demodulation (like BFO) or simple amplification (AF amplifier) but with audio output suppression when no signal is present

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Question 1 of 20

The MF/HF receiver fails to suppress the AF output in the absence of a sufficiently strong input signal. What is the most likely cause?

The AGC circuit has failed.

The BFO circuit has failed.

The squelch circuit has failed.

The AF amplifier circuit has failed.

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Question 1 / 20ZaEJ75nL3px33cX7s3lS

Question 1 of 20ZaEJ75nL3px33cX7s3lS

The MF/HF receiver fails to suppress the AF output in the absence of a sufficiently strong input signal. What is the most likely cause?

Back

Question 1 of 20

ZaEJ75nL3px33cX7s3lS

The MF/HF receiver fails to suppress the AF output in the absence of a sufficiently strong input signal. What is the most likely cause?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed